CN204597798U - A kind of small-sized voltage-stabilized power supply circuit - Google Patents
A kind of small-sized voltage-stabilized power supply circuit Download PDFInfo
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- CN204597798U CN204597798U CN201520159324.XU CN201520159324U CN204597798U CN 204597798 U CN204597798 U CN 204597798U CN 201520159324 U CN201520159324 U CN 201520159324U CN 204597798 U CN204597798 U CN 204597798U
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Abstract
The utility model discloses a kind of small-sized voltage-stabilized power supply circuit; comprise AC power, protective tube, transformer, rectifier, the first filter capacitor, the second filter capacitor, integrated package of pressure-stabilizing, slide rheostat and circuit overcurrent protection; while the utility model can obtain stablizing adjustable voltage; this circuit can play the effect of self-protection; the utility model structure is simple, is specially adapted to the occasions such as school experiment room.
Description
Technical field
The utility model belongs to power circuit field, is specifically related to a kind of small-sized voltage-stabilized power supply circuit.
Background technology
Along with society burns the wind, power consumption equipment and day increase severely, unstable voltage can cause mortal injury or misoperation to equipment, impact is produced, cause incur loss through delay delivery date, many-sided losses such as quality is unstable, acceleration equipment is aging simultaneously, affect and even burn accessory useful life, puzzlement owner being faced need repairing or will update the equipment in a short time, waste resource, even there is security incident in severe patient, cause immeasurable loss, the problem that the use of stabilized voltage power supply is such for people solve, but traditional voltage-stabilized power supply circuit complicated structure, cost is higher, and be not easy to regulate.
Meanwhile, voltage-stabilized power supply circuit on the market, the power supply of output, electric current are all changeless, applicable situation is limited, certainly also has and can export regulated power supply, the voltage-stabilized power supply circuit of current value, but circuit is complicated, expensive, is not suitable for the colonies such as student and uses.
Therefore, need a kind of new technical scheme to solve the problem.
Utility model content
Utility model object: for above-mentioned prior art Problems existing and deficiency, the purpose of this utility model is to provide a kind of small-sized voltage-stabilized power supply circuit.
Technical scheme: the utility model discloses a kind of small-sized voltage-stabilized power supply circuit, comprises AC power, protective tube, transformer, rectifier, the first filter capacitor, the second filter capacitor, integrated package of pressure-stabilizing, slide rheostat and circuit overcurrent protection, AC power is connected with the primary coil of transformer by protective tube, the secondary coil of transformer is connected with the input of integrated package of pressure-stabilizing with the first filter capacitor by rectifier, the tap of slide rheostat is connected with the voltage-regulation end of integrated package of pressure-stabilizing, be connected with circuit overcurrent protection after the output of integrated package of pressure-stabilizing carries out filtering by the second filter capacitor, circuit overcurrent protection comprises voltage comparator, with door, first diode and field effect transistor, the output of integrated package of pressure-stabilizing is connected with the in-phase input end of described voltage comparator, the inverting input input reference voltage signal of voltage comparator, the output of voltage comparator all with the input of door is connected with the output of integrated package of pressure-stabilizing, should be connected with the grid of field effect transistor with the output of door, the source ground of field effect transistor, and the drain electrode of this field effect transistor is connected with the negative pole of the first diode, the positive pole of the first diode is connected with the output of integrated package of pressure-stabilizing.
Alternating current delivers to the primary coil of transformer through protective tube, according to the turn ratio of primary coil and secondary coil, secondary coil exports relevant voltage, and pass through rectifier rectification, first filter capacitor filtering obtains galvanic current, after direct current provides operating voltage to integrated package of pressure-stabilizing, by the voltage of regulation voltage adjustable side, just considerable output voltage can be obtained at the output of integrated package of pressure-stabilizing, simultaneously, the tap of the utility model also by adjusting slide rheostat changes output voltage, when slide rheostat access resistance becomes large, output voltage can raise, the utility model plays self-protection function by adopting circuit overcurrent protection, when output voltage is higher than reference voltage signal, output voltage can be dragged down into low level signal, when output voltage is lower than reference voltage signal, power circuit of the present utility model normally works.
As further optimization of the present utility model, rectifier described in the utility model is bridge rectifier.
As further optimization of the present utility model, integrated package of pressure-stabilizing described in the utility model is LM317 tripod voltage stabilizing chip.
As further optimization of the present utility model; protection diode is provided with between the input of integrated package of pressure-stabilizing described in the utility model and output; the positive pole of this protection diode is connected with the output of integrated package of pressure-stabilizing, and its negative pole is connected with the input of integrated package of pressure-stabilizing.
As further optimization of the present utility model, the voltage-regulation end of integrated package of pressure-stabilizing described in the utility model is provided with the 3rd filter capacitor, carries out filtering to voltage-regulation end, to improve the quality of output voltage.
As further optimization of the present utility model, the output of integrated package of pressure-stabilizing described in the utility model is connected with the voltage-regulation end of integrated package of pressure-stabilizing by the first resistance, slide rheostat, the second resistance, the 3rd filter capacitor.
As further optimization of the present utility model, slide rheostat entirety described in the utility model access.
Beneficial effect: the utility model compared with prior art; the utility model has the following advantages: while can obtain stablizing adjustable voltage; this circuit can play the effect of self-protection, and the utility model structure is simple, is specially adapted to the occasions such as school experiment room.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
F1--protective tube, T1--transformer, D1--bridge rectifier, C1--first filter capacitor, C2--second filter capacitor, D2--protect diode, 1--circuit overcurrent protection, R1--first resistance, R2--slide rheostat, R3--second resistance, C3--the 3rd filter capacitor, D3--first diode, Q1--field effect transistor.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in detail; but illustrate that protection range of the present utility model is not limited to the concrete scope of the present embodiment simultaneously; based on the embodiment in the utility model; those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
It should be noted that, in description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
Embodiment
As shown in Figure 1, the small-sized voltage-stabilized power supply circuit of one of the present embodiment, comprise AC power, protective tube F1, transformer T1, bridge rectifier D 1, first filter capacitor C1, second filter capacitor C2, LM317 tripod voltage stabilizing chip, slide rheostat R2, circuit overcurrent protection 1, AC power is connected with the primary coil of transformer T1 by protective tube F1, the secondary coil of transformer T1 is connected with the input of LM317 tripod voltage stabilizing chip with the first filter capacitor C1 by bridge rectifier D 1, namely a end of bridge rectifier D 1 is connected with one end of the first filter capacitor C1, the b end of bridge rectifier D 1 is connected with the other end of the first filter capacitor C1, the a end of bridge rectifier D 1 is connected with the input of LM317 tripod voltage stabilizing chip.
Be provided with between the input of LM317 tripod voltage stabilizing chip and output and protect diode D2, the positive pole of this protection diode D2 is connected with the output of LM317 tripod voltage stabilizing chip, its negative pole is connected with the input of LM317 tripod voltage stabilizing chip, the output of LM317 tripod voltage stabilizing chip is connected with one end of slide rheostat R2 by the first resistance R1, the other end of slide rheostat R2 is connected with the voltage-regulation end of LM317 tripod voltage stabilizing chip by the second resistance R3 and the 3rd filter capacitor C3's, the tap terminals of this slide rheostat R2 is connected with the voltage-regulation end of LM317 tripod voltage stabilizing chip, the 3rd filter capacitor C3 of the present embodiment, filtering is carried out to voltage-regulation end, to improve the quality of output voltage, be connected with circuit overcurrent protection 1 after the output of LM317 tripod voltage stabilizing chip carries out filtering by the second filter capacitor C2.
The circuit overcurrent protection 1 of the present embodiment comprises voltage comparator, with door, first diode D3 and field effect transistor Q1, the output of LM317 tripod voltage stabilizing chip is connected with the in-phase input end of described voltage comparator, the inverting input input reference voltage signal of voltage comparator, the output of voltage comparator all with the input of door is connected with the output of LM317 tripod voltage stabilizing chip, should be connected with the grid of field effect transistor Q1 with the output of door, the source ground of field effect transistor Q1, and the drain electrode of this field effect transistor Q1 is connected with the negative pole of the first diode D3, the positive pole of the first diode D3 is connected with the output of LM317 tripod voltage stabilizing chip.
Alternating current delivers to the primary coil of transformer T1 through protective tube, according to the turn ratio of primary coil and secondary coil, secondary coil exports relevant voltage, and by bridge rectifier D 1 rectification, first filter capacitor C1 filtering obtains galvanic current, after direct current provides operating voltage to LM317 tripod voltage stabilizing chip, by the voltage of regulation voltage adjustable side, just considerable output voltage can be obtained at the output of LM317 tripod voltage stabilizing chip, simultaneously, also the tap by adjustment slide rheostat R2 changes output voltage, when slide rheostat R2 access resistance becomes large, output voltage can raise.
Output voltage and the reference voltage signal of LM317 tripod voltage stabilizing chip access voltage comparator; when output voltage is higher than reference voltage signal; voltage comparator exports high level; be now high level with the output voltage of door; field effect transistor conducting; the output voltage of LM317 tripod voltage stabilizing chip is dragged down into low level signal; when output voltage is lower than reference voltage signal; voltage comparator output low level; be low level with the output voltage of door; the output voltage of LM317 tripod voltage stabilizing chip is constant, plays good self-protection effect.
Embodiment of the present utility model provides for the purpose of example and description, and is not exhaustively or by the utility model be limited to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present utility model and practical application are better described, and enables those of ordinary skill in the art understand the utility model thus design the various embodiments with various amendment being suitable for special-purpose.
Claims (7)
1. a small-sized voltage-stabilized power supply circuit, is characterized in that: comprise AC power, protective tube, transformer, rectifier, the first filter capacitor, the second filter capacitor, integrated package of pressure-stabilizing, slide rheostat and circuit overcurrent protection, described AC power is connected with the primary coil of transformer by protective tube, the secondary coil of described transformer is connected with the input of integrated package of pressure-stabilizing with the first filter capacitor by rectifier, the tap of described slide rheostat is connected with the voltage-regulation end of integrated package of pressure-stabilizing, be connected with circuit overcurrent protection after the output of described integrated package of pressure-stabilizing carries out filtering by the second filter capacitor, described circuit overcurrent protection comprises voltage comparator, with door, first diode and field effect transistor, the output of integrated package of pressure-stabilizing is connected with the in-phase input end of described voltage comparator, the inverting input input reference voltage signal of described voltage comparator, the output of voltage comparator all with the input of door is connected with the output of integrated package of pressure-stabilizing, should be connected with the grid of field effect transistor with the output of door, the source ground of described field effect transistor, and the drain electrode of this field effect transistor is connected with the negative pole of the first diode, the described positive pole of the first diode is connected with the output of integrated package of pressure-stabilizing.
2. the small-sized voltage-stabilized power supply circuit of one according to claim 1, is characterized in that: described rectifier is bridge rectifier.
3. the small-sized voltage-stabilized power supply circuit of one according to claim 1, is characterized in that: described integrated package of pressure-stabilizing is LM317 tripod voltage stabilizing chip.
4. the small-sized voltage-stabilized power supply circuit of one according to claim 1; it is characterized in that: between the input of described integrated package of pressure-stabilizing and output, be provided with protection diode; the positive pole of this protection diode is connected with the output of integrated package of pressure-stabilizing, and its negative pole is connected with the input of integrated package of pressure-stabilizing.
5. the small-sized voltage-stabilized power supply circuit of one according to claim 1, is characterized in that: the voltage-regulation end of described integrated package of pressure-stabilizing is provided with the 3rd filter capacitor.
6. the small-sized voltage-stabilized power supply circuit of one according to claim 5, is characterized in that: the output of described integrated package of pressure-stabilizing is connected with the voltage-regulation end of integrated package of pressure-stabilizing by the first resistance, slide rheostat, the second resistance, the 3rd filter capacitor.
7. the small-sized voltage-stabilized power supply circuit of one according to claim 6, is characterized in that: the access of described slide rheostat entirety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520159324.XU CN204597798U (en) | 2015-03-20 | 2015-03-20 | A kind of small-sized voltage-stabilized power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520159324.XU CN204597798U (en) | 2015-03-20 | 2015-03-20 | A kind of small-sized voltage-stabilized power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204597798U true CN204597798U (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520159324.XU Expired - Fee Related CN204597798U (en) | 2015-03-20 | 2015-03-20 | A kind of small-sized voltage-stabilized power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287585A (en) * | 2018-01-25 | 2018-07-17 | 西安文理学院 | A kind of regulated power supply |
-
2015
- 2015-03-20 CN CN201520159324.XU patent/CN204597798U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287585A (en) * | 2018-01-25 | 2018-07-17 | 西安文理学院 | A kind of regulated power supply |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20200320 |
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| CF01 | Termination of patent right due to non-payment of annual fee |